<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    // var m = new Map();
    // m.set(100,100);
    // m.set("arr","eds");
    // m.set([1,2,3],"eds");
    // m.set(undefined,"eds");

    // console.log(m);

    var arr = [[1,2],["a","a"],[NaN,2]];
    var m = new Map(arr);
    console.log(m);

    console.log(arr=[...m]);
</script>
</html>